Improvement in compositions for stereotyping



UNITED STATES PATENT OFFICE.

VILLIAM MACRONE AND WILLIAM MACKENZIE, OF GLASGOXV, NORTH BRITAIN.

IMPROVEMENT lN COMPOSITIONS FOR STEREOTYPING.

Specification forming part of Letters Patent No. 153,095, dated July 14,1874 application filed February 21, 1874.

To all whom it may concern Be it known that We, WILLIAM MAORONE andWILLIAM MACKENZIE, both of Glasgow, in the county of Lanark, NorthBritain, have invented certain Improved Composition for Stereotyping, ofwhich the following is a specification.

The object of our invention is a composition of which to make the moldsused in producing stereotype-plates, the said composition coning; ofplaster-ot paris, red ocher, and starch.

In making the molding-composition, we use, preferably, thirty parts ofplaster, two parts of red ocher, and one part of starch. These are mixedtogether, and water is added until the preparation is sufficientl yplastic to be VILLIAM MACRONE. W'I LLIAM MACKENZIE.

WVitnesses EDWARD FISHER BAMBER, J'OIIN CLARK.

